[填空题]So far, most of the people using M-Pesa have used it to send small amounts of money.

[单项选择]Types of risks
So far we have used the term "risk" rather loosely. One type of risk is default risk, that is, the risk that the borrower will simply not repay the loan, due to either dishonesty or plain inability to do so. Another type of risk, called purchasing - power risk, is the risk that, due to an unexpectedly high inflation rate, the future interest payments, and the principal of the loan when finally repaid, will have less purchasing power than the lender anticipated at the time the loan was made. A similar risk is faced by borrowers. A borrower may cheerfully agree to pay, say, 15 percent interest, expecting that a 12 percent inflation rate will reduce the real value of the loan. But inflation may be only 4 percent.For Paragraph 1 choose the summary which you think best expresses the main idea.
A. The existence of inflation produces purchasing - power risk.
B. Purchasing - power risk involves a loss in the value of money loaned or borrowed be

[填空题]It became by far the most widely used code because it was the easiest to understand and ______.(传输也最快)

[单项选择]PCA products have so far caused （　）.
A. 3,516 people sent to hospital
B. 691 people sickened
C. 9 food recalled in history
D. 2 plants contaminated

[填空题]Work-sharing schemes have so far been unsatisfactory.

[单项选择]Most students used to spend so much time （） TV, （） they.
A. watch; did
B. watching; didn’t
C. watching; did

[填空题]M-Pesa can only be used by people using one phone network.

[单项选择]The flats I have looked at so far were too expensive. So I’m better off （）where I am.
A. stay
B. staying
C. to stay
D. stayed

[单项选择]Today, most countries in the world have canals. Some canals, such as the Suez or the Panama, (62) ships weeks of time by making their voyage a thousand miles shorter. Other canals permit boats to reach cities that are not located on the coast. (63) other canals drain lands where there is too much water, help or (64) fields where there is not enough water.
The (65) of a canal depends on the kind of boats going through it. The canal must be wide enough to permit two of the (66) boats using it to (67) each other easily. It must be deep enough to leave about two feet of water (68) the keel of the largest boat using the canal.
Some canals have sloping sides, while others have sides that are nearly (69) Canals that are cut through rock can have nearly Vertical sides. (70) , canals with earth banks may (71) if the angle of their sides is too steep. Some canals are lined with
A. limit
B. confine
C. decrease
D. increase