[单项选择]What is the main problem caused by the usual way of plowing？（）
A. The crop’s blooming period is delayed.
B. The roots of crops are cut off.
C. The topsoil is seriously damaged.
D. The growth of weeds is accelerated.

[单项选择]What is tile main problem caused by the usual way of ploughing？（）
A. The crop’s blooming period is delayed.
B. The roots of crops are cut off.
C. The topsoil is seriously damaged.
D. The growth of weeds is accelerated.

[单项选择]
What is the main problem caused by the usual way of plowing
A. The crop’s blooming period is delayed.
B. The roots of crops are cut off.
C. The topsoil is seriously damaged.
D. The growth of weeds is accelerated.

[简答题] the railway problem caused by strike

[单项选择]According to the woman, what caused the problem
A. A malfunction
B. A car accident
C. Some road repairs
D. Rush hour traffic

[简答题]What language skills are emphasized and what main techniques are used in the Direct Method classroom

[填空题]

Helen Smith:
What better way to start off my senior year in high school than by reading something I am entirely familiar with I couldn’t have described this online revolution any better. The expansion of Facebook and its continuing success make me more interested in the world of computers and web design and the career choices they offer. Thanks, Mark Zuckerberg, for "poking" me into Facebook.
Kevin Stuart:
Rather than seeing Facebook as the hottest connection tool, I think it’s more like the latest way to make an already impersonal world even more impersonal. How sad that our society is so isolated that we need a computer to "connect" with others. No, thanks! I’m going to continue hanging out on the street corner, and hope someone builds a village square someday—now, there’s a radical idea!
Robert Meyer:
Isn’t it a contradiction that s

[填空题]The usual way Americans signal their attention to their talking partners is to look at their eyes or mouths.

[判断题]The vapor problem was mainly caused by the chemical containments from the ground water out of the company.

[单项选择]The usual way to ensure reliable delivery is to provide the （71） with some feedback about what is happening at the other end of the line. Typically, the protocol calls for the receiver to send back special （72） frame bearing positive or negative （73） about the incoming frames. If the sender receives a positive acknowledgement about a frame, it knows the the frame has arrived safely. On the other hand, a negative acknowledgement means that something has gone wrong, and the frame must be transmitted again. An additional complication comes from the possibility that hardware troubles may cause a frame to （74） completely. In this case, the receiver will not react at all, since it has no any reason to react. It should be clear that a protocol in which the sender transmits a frame and then waits for an acknowledgement, positive or negative, will hang forever if a frame is ever lost due to, for example, （75） hardware.。
A. data
B. controll
C. request
D. session