中央银行增加基础货币供给的途径有（）。 A.再贴现 B.再贷款 C.财政借款 D.从

运用元素周期律分析下面的推断，其中错误的是(　　)。

A．铍(Be)的氧化物的水化物可能具有两性

B．砹(At)为白色固体，HAt不稳定，AgAt感光性很强

C．硫酸锶(SrSO₄)是难溶于水的白色固体

D．硒化氢(H₂Se)无色、有毒，比H₂S更不稳定

单句改错。

( ) 1. We learnt from each other since we became friends.    _________

                     A      B                      C             D

(     ) 2. Danny said that he hadn't finished doing his lessons already.   _________

                        A                 B                   C                       D

( ) 3. She hopes you and I  to  come back  in two days.   _________

                                  A       B          C        D

(     ) 4. The teacher often asked us  don't speak  in class.   _________

                    A                      B              C            D

(     ) 5. Those poor children will be happy  only if we will help them.   _________

                                  A                 B           C              D

( ) 6. Your knowledge of Chinese are  tested when you play the game.   _________

                                     A              B       C                    D

( ) 7. This computer was  made  by Beijing  last year.   _________

                                    A      B      C                 D

(     ) 8. I'm sorry I forgot my English book at home? Can I bring it here tomorrow?   ________

                  A            B                                  C                  D

( ) 9. I was searching  the Internet  while my parents watched TV.   _________

                       A                    B           C                         D

( ) 10. We are made read English for  an hour every morning by our English teacher.   ________

                                   A                B   C                                D

牙槽嵴在牙缺失后的吸收速率何时最快（）。

A.前一个月

B.前二个月

C.前三个月

D.前六个月

E.两年内

When products made in factories     ，they are thrown away as garbage．

A．come to an end

B．are put to use

C．are used up

D．wear out