已知a+b=0，a≠b，则ba（a+1）+ab（b+1）=______．

Polar explorers have to be extremely _____ to bear the climate and other hardships.

A．tough

B．rough

C．difficult

D．brave

中央农村工作会议19日至20日在北京召开，会议指出，推进农业供给侧结构性改革，促进农业农村发展由过度依赖资源消耗、主要满足“量”的需求，向追求（）、更加注重满足“质”的需求转变。

A.农产品质量

B.绿色生态可持续

C.绿色农产品

低钾血症的病人，补钾后病情仍无改善时，应首先考虑缺乏

A．镁

B．磷

C．钠

D．氯

E．钙

When anyone opens a current account at a bank, he is lending the bank money. He may (1) the repayment of the money at any time, either (2) cash or by drawing a check in favor of another person. (3) , the banker-customer relationship is that of debtor and creditor who is (4) depending on whether the customer’s account is (5) credit or is overdrawn. But, in (6) to that basically simple concept, the bank and its customer (7) a large number of obligations to one another. Many of these obligations can give (8) to problems and complications but a bank customer, unlike, say, a buyer of goods, cannot complain that the law is (9) against him.

The bank must (10) its customer’s instructions, and not those of anyone else. (11) , for example, a customer opens an account, he instructs the bank to debit his account only in (12) of checks drawn by himself. He gives the bank (13) of his signature, and there is a very firm rule that the bank has no right or (14) to pay out a customer’s money (15) a check on which its customer’s signature has been (16) It makes no difference that the forgery may have been a very (17) one: the bank must recognize its customer’s signature. For this reason there is no (18) to the customer in the practice, (19) by banks, of printing the customer’s name on his checks. If this (20) Forgery, it is the bank that will lose, not the customer. (254 words)

7（）

A.owe

B.commit

C.attribute

D.embark