Cho hợp chất có công thức hóa học K2CO3, biết K có hóa trị I và nhóm (CO3) có hóa trị II. Vậy biểu thức nào sau đây viết đúng quy tắc hóa trị?
(Chỉ được chọn 1 đáp án)
A.I.2 = II.3
.B.I +2 = II + 1.
C.I.II = 2.1.
D.2.I = 1.II.
các bạn làm mấy bài tìm x này theo bảng xét dấu hộ mk
a. I 5+2x I +2x=x-3
b.I x+1 I + I x+2 I=0
c.I 3x-1 I - I 2x+3 I = 0
d. I x-1 I -I 2-x I +x=0
1.I haven't finished this book yet.
A.I'm still reading this book B.I have read this book before.
C.The book I'm reading hasn't finished D.I will read this book some day
1.I haven't finished this book yet.
A.I'm still reading this book
B.I have read this book before.
C.The book I'm reading hasn't finished
D.I will read this book some day
1. I find it easy to make a speech in public.
A.I get used to making a speech in public.
B.I had difficulty in making a speech in public.
C.I used to make a speech in public.
D.I’m not familiar with making a speech in public
2. Lan and Maryam are pen pals .They ____________ each other twice a month.
A.have written to
B.correspond with
C.write
D.correspond
3. The little hero was ____________________ invited to the party of the President.
A.offically
B.officer
C.officially
D.office
4. / feels/ like / of/ their family / being/ a member/ Van / .
A.Van feels being like a member of their family.
B.Van feels like member of being a their family.
C.Van feels like of being a member their family.
D.Van feels like being a member of their family.
5. It’s time you _____________working seriously .
A.starting
B.should start
C.start
D.started
will you have time to help us?-..............I'm very busy at the moment.
a.I'm afraid not b.I think so c. i don't expect so
will you have time to help us?-..............I'm very busy at the moment.
a.I'm afraid not b.I think so c. i don't expect so
Mark the letter A, B, c, or D to indicate the sentence that has similar meaning to the first sentence.
I started working as a volunteer three years ago.
A.
I have worked as a volunteer for three years.
B.
I have started working as a volunteer for three years.
C.
I worked as a volunteer for three years.
D.
I have worked as a volunteer three years ago.
3
Mark the letter A, B, C or D to indicate the sentence that is in meaning to the given sentences.
(Dựa vào các từ gợi ý, hãy chọn đáp án đúng nhất)
She/ like/ dance/ sing.
A.
She like dancing and sing.
B.
She likes dancing and singing.
C.
She like dancing and singing.
D.
She likes to dance and singing.
4
Mark the letter A, B, c, or D to indicate the sentence that has similar meaning to the first sentence.
Cycling is faster than walking.
A.
Walking is as fast as cycling.
B.
Walking is not as fast as cycling.
C.
Walking is the same as cycling.
D.
Walking is not different from cycling.
5
Mark the letter A, B, c, or D to indicate the sentence that has similar meaning to the first sentence.
They love eating fried chicken.
A.
They hate eating fried chicken.
B.
They interests in eating chicken.
C.
They are interested in eating fried chicken.
D.
They are interested in eat fried chicken.
Mark the letter A, B, C, or D to indicate the correct answer to each of the following sentence.
school/ I/ and/ this/ my/ student/ am/ a/ is
A.
I am a student and this is my school.
B.I am a student and is this my school.
C.This a student and is I am my school.
D.I am this is my school a student and.
7Choose the word which best fits each gap.
My dream school is a quiet school (23) ___________ we have just two or three hours a day, in the morning. Then, in the afternoon, we can do many (24) ___________ like singing, dancing, playing soccer, basketball, rugby. We won’t have tests and mark, either. The teachers will not (25) ___________ homework, so we can do whatever we want after school. In my dream school, we can also choose the (26) ___________ we want: for example, you’re not going to learn mathematics or physics if you hate it. So it’s a free school where you can learn with calm and serenity and you can make (27) ___________ friends during afternoon activities!
A.
when
B.how
C.where
D.what
8Choose the correct answer which has the same meaning to the first one.
Our school has more than 2000 students.
A.
There are more than 2000 students in our school.
B.More than 2000 students in our school.
C.There are our school more than 2000 students in.
D.There has more than 2000 students in our school
9Choose the word which best fits each gap.
My dream school is a quiet school (23) ___________ we have just two or three hours a day, in the morning. Then, in the afternoon, we can do many (24) ___________ like singing, dancing, playing soccer, basketball, rugby. We won’t have tests and mark, either. The teachers will not (25) ___________ homework, so we can do whatever we want after school. In my dream school, we can also choose the (26) ___________ we want: for example, you’re not going to learn mathematics or physics if you hate it. So it’s a free school where you can learn with calm and serenity and you can make (27) ___________ friends during afternoon activities!
A.classrooms
B.classmates
C.classes
D.class
Trong mạch điện có sơ đồ như hình vẽ trên các ampe kế có số chỉ tương ứng là I¹, I²,I³. Các số chỉ này có quan hệ nào dưới đây?
A.I²=I¹+I³
B.I¹=I²-I³
C.I¹=I²+I³
D.I³=I²+I¹
GIẢI HỘ MÌNH-.-??
What were you doing yesterday? A.I read books B.I was reading books C.I am reading books D.I reading books
Choose the correct answer
1.How long have you lived there?___________
A.For 10 years B.One month ago C.Since two weeks D.Last month
2.My dad is good at playing tennis.____________
A.So is my dad B.My dad isn't C.Can he play hockey? D.A,B,C
3.I have never traveled to America.______________
A.I have, either B.I have too C.I haven't,either D.I have
Choose the correct answer
1.How long have you lived there?___________
A.For 10 years B.One month ago C.Since two weeks D.Last month
2.My dad is good at playing tennis.____________
A.So is my dad B.My dad isn't C.Can he play hockey? D.A,B,C
3.I have never traveled to America.______________
A.I have, either B.I have too C.I haven't,either D.I have
