1/2 m lụa và 3/5  vải là:

50 000-23 000=27 000(đồng)

1/5 m vải là:

27 000-23 000=4 000(đồng)

1 m vải là:

4 000:1/5=20 000(đồng)

15 m vải là:

20 000x15=300 000(đồng)

1m lụa là:

50 000-20 000=30 000(đồng)

8 m lụa là:

30 000x8=240 000(đồng)

Đáp số:lụa:240 000 đồng

            vải:300 000 đồng

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.

A. preservation

B. development

C. computer

D. communicate

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

Farming has come a long way since the days of horse-drawn plows, and now it’s heading swiftly into the twenty-first century. Research at Indiana’s Purdue University uses the Navistar Global Positioning System (GPS) to help increase crop yields and reduce chemical use. GPS uses satellite signals to determine location within inches. Under Purdue’s scheme, a farmer out in the field would use a GPS receiver mounted on his vehicle to pinpoint his position. A computer linked to the receiver and programmed with the field’s soil conditions – which can vary widely from one area to another – would tell the farmer precisely where the plant and how much pesticide and fertilizer to use at that specific site. “Currently the number one cost to the famer is chemicals” say Gary Kurtz, a Professor of Agriculture Engineering at Purdue. Site-specific farming can increase yields while reducing chemical use.

But the cost of this new technology may be too high for the small farmer. The cost of taking and testing soil samples every few feet in a farmer’s field is a limiting factor. Soil tests can run $7 to  $8 each. Mark Morgan, assistant Professor of Agriculture Engineering at Purdue and his graduate assistants are working on a sensor to be attached to the front of a farm implement, enabling the farmer to perform his own soil tests on the go.

According to the passage, the phrase “on the go” has the meaning of ______.

A. sensing the time is right

B. while driving a plow

C. preparing the soil

D. at the same time as planting

Phát biểu nào sau đây đúng ?

A. Polime là hợp chất do nhiều phân tử monome hợp thành

B. Polime là hợp chất có phân tử khối lớn

C. Polime là hợp chất có phân tử khối rất lớn do nhiều đơn vị nhỏ liên kết với nhau tạo nên

D. Các polime đều được tổng hợp bằng phản ứng trùng hợp