大气中二氧化碳浓度的适当升高可以提高许多农作物的产量，这是因

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问题选择题

大气中二氧化碳浓度的适当升高可以提高许多农作物的产量，这是因为[ ]

A．二氧化碳是光合作用产物，浓度升高能增强光合作用

B．二氧化碳是光合作用原料，浓度升高能增强光合作用

C．二氧化碳是光合作用原料，浓度升高能增强呼吸作用

D．二氧化碳是呼吸作用原料，浓度升高能增强光合作用

答案

答案：B

阅读理解

阅读短文，判断下列句子正(T)误(F)。

Tom is seven, he goes to school every day. The school is next to his home, so he goes there on foot and

comes back home on time. But today he is late. His mother asks him, "Why are you late today?"

"I am in the headmaster's office."

"Why do you go to the headmaster's office?"

"Because my teacher asks us a question in class, and nobody can answer it, but I can."

"It's good to answer the teacher's questions, what is the question?"

"The question is — who puts ink on my chair?"

(headmaster 校长; ink 墨水; Nobody 没有人; because 因为)

( ) 1. Tom's home is not far from his school.

( ) 2. Tom goes to school by bike.

( ) 3. Tom puts ink on the teacher's chair.

( ) 4. It is good for Tom to do.

( ) 5. Tom is six.

单项选择题

在全国人民代表大会上，国务院 * * 要作《政府工作报告》，并经各位人大代表审议并表决后才能通过。这体现了（）①全国人民代表大会是最高国家权力机关②全国人大在行使最高监督权和决定权③体现了国家政治生活中的组织活动基本原则④国务院在国家权力机构中居于核心地位

A、①②③④

B、①②③

C、②③④

D、①②④