Giải thích vì sao cây trên cạn bị ngập úng lâu sẽ chết.

Cho các phát biểu sau:

(1) Fructozơ và glucozơ đều có khả năng tham gia phản ứng tráng bạc;

(2) Saccarozơ và tinh bột đều không bị thủy phân khi có axit H 2 S O 4 (loãng) làm xúc tác;

(3) Tinh bột được tạo thành trong cây xanh nhờ quá trình quang hợp;

(4) Xenlulozơ và saccarozơ đều thuộc loại đisaccarit;

Phát biểu đúng là

A. (3) và (4).

B. (1) và (3).

C. (1) và (2)

D. (2) và (4)

Ghi Đ (đúng) hoặc S (sai) vào ô trống bên cạnh các câu sau : 

Read the following passage and mark the letter A, B, C, or D to indicate the correct word for each of the blanks from (1) to (10).

PROACTIVE JOB HUNTING

Once upon a time, people left school or university, joined a company and stayed with it until they retired. The concept of a job for life is now long (1) x , and nowadays many employees find it hard o stay loyal to their companies for even a relatively short period of time. According to a recent survey, this is particularly (2) x in London, where more than half of those asked said that they constantly (3) x one eye on other job opportunities, (4) x they are fairly happy in their existing job. A high number of London workers say that they are always on the (5) x , although they are content and motivated in their current position.

Job seekers find that the internet (6) x them with a quick and easy way to find out what's available, and 53 percent said that they had applied for a job or registered with an employment agency inthe past 12 months. This proactive (7) x means that people can look for a perfect job match with the (8) x of effort. But while this is good for job hunters, the growing lack of company loyalty could (9) x up being a big problem for employers .Perhaps surprisingly, the (10) x factors attracting job seekers was not more money, but challenging and interesting work.Question 7

A. manner

B.custom

C. approach

D. style