搜题请搜索小程序“爱下问搜题”
问题 单项选择题

CO2固定的还原性三羧酸途径中，多数酶与正向三羧酸循环途径相同，只有依赖ATP（）是个例外。

A、柠檬酸合酶

B、柠檬酸裂合酶

C、异柠檬酸脱氢酶

D、琥珀酸脱氢酶

答案

参考答案：B

不定项选择

如图所示，质量相同的木块A、B用轻弹簧连接置于光滑的水平面上，开始弹簧处于自然长度状态，现用水平恒力F向右推木块A，则弹簧在第一次被压缩到最短的过程中

[ ]

A.A、B速度相同时加速度aA=aB

B.A、B速度相同时加速度aA<aB

C.A、B加速度相同时速度vA=vB

D.A、B加速度相同时速度vA<vB
查看答案
完形填空

Australia and the United States are about the same in size, and their western lands are both not rich   5    soil. It was on the eastern coast of Australia and America that the English first settled, and both colonies soon began to develop towards the west. However, this westward   6   (move) took place   7           because the English were searching for better land than the population was increasing. Settlements of the west part of both countries developed quickly after gold    8         (discover) in America in 1849 and in Australia two years later.

Although the development of these two countries has a lot in common, there are some   9   (strike) differences as well. The United States gained its independence from England by revolution while Australia won its independence without having to go to war. Australia,  10   (like) the United States, was firstly turned into a colony by English prisoners and its economic development was in wheat growing and sheep raising. By 1922, for example, Australia had fifteen times more sheep than it had people or almost half as many sheep as there are people today in the United States. Australia and the United States have more in common with each other than either one has with most of the rest of the world.
查看答案