菱形周长为20cm,它的一条对角线长6cm,则菱形的面积为( )A.6 B.1

题型:选择题

问题:

菱形周长为20cm,它的一条对角线长6cm,则菱形的面积为(   )
A.6
B.12
C.18
D.24
考点:菱形,菱形的性质,菱形的判定
题型:选择题

任务型阅读。

     Can plants eat people? Probably not, but there are many plants that eatmeat. Some of them are big,

and they can eat small animals. One famous meat-eating plant is the Venus flytrap.

     The Venus flytrap is a very strange plant. It grows in dry parts of the United States. Its leaves are like

the pages of a book. 3. They can open and close very quickly. Inside the leaves. there are three small

hairs. If an insect touches one of the hairs, the leaf closes quickly. The insect cannot get out. In about half

an hour,the leaf presses the insect until it is dead. Then, the plant covers. the insect with a special liquid

(液体). Slowly, the plant eats the insect.

     Plants arc living things that have leaves and roots and grow in earth.

     4. Most of them get energy from the sun, the air, and the ground. In some places,the ground is very

poor. It doesn't have all the important things that plants need, especially nitrogen (氦). Animal meat has a

lot of nitrogen, so some plants eat meat to get what they need. Let's hope that some of the bigger plants

don't get the same idea!

1. Why is Venus flytrap a famous plant?

    ____________________________________.

2. In some places, why do some plants get energy from animal meat?

   _______________________________________________________.

任务(二)

把文中划线部分译成汉语。

3. ______________________________________________________。

4. ______________________________________________________。

任务(三)

请给短文选一个适当的英文标题。

5. Which is the best title of this passage?

A. Meat-eating plants

B. Can plants eat people?

C. The Venus flytrap is a very strange plant

D. Animal meat has a lot of nitrogen

题型:选择题

满载砂子的总质量为M的小车,在光滑水平面上做匀速运动,速度为v0.在行驶途中有质量为m的砂子从车上漏掉,则砂子漏掉后小车的速度应为:(  )

A.v0

B.

Mv0
M-m

C.

mv0
M-m

D.

(M-m)v0
M

题型:选择题

根据数据串行通信收发两端的时钟只需要在传送一个字节的时间内保持同步还是需要在传送一整块数据的时间内保持同步,可以分为“异步”和“同步”两种方式。下列业余无线电数字通信方式中属于异步方式的例子是()

A.RTTY

B.QPSK31

C.PACKET

D.PACTOR-II

题型:选择题

《易制毒化学品购销和运输管理办法》何时实施()。

A、2006-10-1

B、2005-11-1

C、2006-7-1

D、2005-7-1

题型:选择题

计算机病毒的可触发性是指病毒通常在一定的触发条件下,激活其传播机制进行传染,或激活其破坏机制对系统造成破坏。

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