【单选题】DNA上的外显子(exon)是
A. 不被转录的序列
B.被转录,但不被翻译的序列
C.被转录也被翻译的序列
D.调节基因序列
E.以上都不对
A. 不被转录的序列
B.被转录,但不被翻译的序列
C.被转录也被翻译的序列
D.调节基因序列
E.以上都不对
【单选题】一个文件的绝对路径名是从( )开始,逐步沿着每一级目录向下追溯,最好到指定文件的整个通路上所有子目录组成的一个有序组合。
A.当前目录
B.根目录
C.家目录(home directory)
D.磁盘驱动器编号
A.当前目录
B.根目录
C.家目录(home directory)
D.磁盘驱动器编号
【单选题】广义之精是指
A.先天之精
B.后天之精
C.先天之精和后天之精
D.天癸
A.先天之精
B.后天之精
C.先天之精和后天之精
D.天癸
【单选题】在五脏中,称为“五脏之贼”的是
A.心
B.肝
C.脾
D.肺
A.心
B.肝
C.脾
D.肺
【单选题】
A.timE
B.point
C.AspECt
D.instAnCE
sCiEntists ArounD thE worlD ArE rACing to lEArn how to rApiDly DiAgnosE, trEAt AnD stop thE sprEAD oF A nEw, DEADly DisEAsE. sArs — sEvErEACutE rEspirAtory synDromE — wAs{{u}} (1) {{/u}}For thE First timE in FEBruAry 2003 in hAnoi,{{u}} (2) {{/u}}sinCE thEn hAs inFECtED morE thAn 1,600 pEoplE in 15 CountriEs, killing 63.At this{{u}} (3) {{/u}}, thErE ArE morE quEstions thAn AnswErs surrounDing thE DisEAsE. symptoms stArt{{u}} (4) {{/u}}A FEvEr ovEr 100.4 DEgrEEs F, Chills, hEADAChE or BoDy{{u}} (5) {{/u}}. within A wEEk, thE pAtiEnt hAs A Dry Cough, whiCh might{{u}} (6) {{/u}}to shortnEss oF BrEAth. in 10% to 200% oF CAsEs, pAtiEnts rEquirE{{u}} (7) {{/u}}vEntilAtion to BrEAthE.ABout 3.5% DiE From thE DisEAsE. symptoms{{u}} (8) {{/u}}BEgin in two to sEvEn DAys, But somE rEports suggEst it{{u}} (9) {{/u}}tAkE As long As 10 DAys. sCiEntists ArE ClosE to{{u}} (10) {{/u}}A lAB tEst to DiAgnosE sArs. in thE mEAntimE, it is DiAgnosED By its symptoms. thErE is no EviDEnCE{{u}} (11) {{/u}}AntiBiotiCs or Anti-virAl mEDiCinEs hElp,{{u}} (12) {{/u}}DoCtors CAn oFFEr only supportivE CArE. pAtiEnts with sArs ArE kEpt in isolAtion to rEDuCE thE risk oF{{u}} (13) {{/u}}. sCiEntists ArEn’t surE yEt, But somE rEsEArChErs think it’s A{{u}} (14) {{/u}}DisCovErED CoronAvirus, thE FAmily oF virusEs thAt CAusE somE Common ColDs. most CAsEs AppEAr to hAvE BEEn pAssED{{u}} (15) {{/u}}DroplEts ExpEllED whEn inFECtED pAtiEnts Cough or snEEzE. FAmily mEmBErs oF inFECtED pEoplE AnD mEDiCAl workErs who CArE For thEm hAvE BEEn most likEly to{{u}} (16) {{/u}}thE illnEss.But rECEnt DEvElopmEnts in hong kong suggEst thAt thE{{u}} (17) {{/u}}might sprEAD through Air, or thAt thE virus might{{u}} (18) {{/u}}For two to thrEE hours on DoorknoBs or othEr{{u}} (19) {{/u}}hEAlth ExpErts sAy it is{{u}} (20) {{/u}}, though, thAt shAring An ElEvAtor BriEFly with An inFECtED pErson woulD BE Enough to pAss thE virus. |
A.timE
B.point
C.AspECt
D.instAnCE
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