问题
选择题
酿制甘甜的葡萄美酒，主要利用（ ）
A．甲烷细菌
B．枯草杆菌
C．霉菌
D．酵母菌
答案
微生物的发酵在食品的制作中具有重要的作用，如酿酒时要用到酵母菌，在无氧的条件下，酵母菌能分解葡萄糖产生酒精和二氧化碳．可见D符合题意．
故选：D
搜题请搜索小程序“爱下问搜题”
酿制甘甜的葡萄美酒，主要利用（ ）
A．甲烷细菌
B．枯草杆菌
C．霉菌
D．酵母菌
微生物的发酵在食品的制作中具有重要的作用，如酿酒时要用到酵母菌，在无氧的条件下，酵母菌能分解葡萄糖产生酒精和二氧化碳．可见D符合题意．
故选：D
Task 1
Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C and D. You should make the correct choice and mark the corresponding letter on the Answer Sheet with a single line through the center.
| Do you want to know something about the history of weather Don’t look at the sky. Don’t look for old weather reports. Looking at tree rings is more important. Correct weather reports date back only one century, but some trees can provide an exact record of the weather even further back. It is natural that a tree would grow best in a climate with plenty of sunlight and rainfall. It is also expected that little sunlight or rainfall would limit the growth of a tree. The change from a favorable to an unfavorable climate can be determined by reading the pattern of rings in a tree trunk. To find out the weather of ten years ago, count the rings of a tree trunk from the outside to the inside. If the tenth ring is far from the other rings, then it is certain that plenty of sunny and rainy weather occurred. If the rings are close together, then the climate was bad for the tree. Studying tree rings is important not only for the history of weather, but also for the history of man. In a region of New Mexico you’ can find only sand-no trees and to people. However, many centuries ago a large population lived there. They left suddenly. Why A scientist studied patterns of dead rings which had grown there. He thought that the people had to leave because they had cut down all the trees. Trees were necessary to make fires and buildings. So, after the people destroyed the trees, they had to move. In this instance, studying tree rings uncovered an exciting fact about the history of man. |
The scientists are interested in studying tree rings because they can tell ______ .
A．whether in that area the climate was favorable or not
B．whether people took good care of the trees or not
C．whether a particular tree was healthy or not
D．whether a particular tree were